MBE 900 4000 Troubleshooting

Section 11.2 Troubleshooting PID 110

Section 11.2
Troubleshooting PID 110

The Engine Coolant Temperature (ECT) sensor is mounted on the front connector housing toward the front of the cylinder block directly below the oil separator on the MBE 900 engines (see Figure "Location of Engine Coolant Temperature Sensor on the MBE 900 Engine" ) and on the side of cylinder block between units pumps No. 2 and 3 on the MBE 4000 engines (see Figure "Location of Engine Coolant Temperature Sensor on the MBE 4000 Engine" ).‪

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 1. Coolant Delivery Hose‪

 6. Electrical Connector‪

 2. Crankcase Breather Hose‪

 7. Engine Coolant Temperature Sensor‪

 3. Front Connector Housing‪

 8. Coolant Pump Connector Fitting‪

 4. Connector Housing Gasket‪

 9. Mounting Bolt‪

 5. Oil Separator‪

Figure 1. Location of Engine Coolant Temperature Sensor on the MBE 900 Engine

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 1. Cylinder Block‪

 3. Engine Coolant Temperature Sensor‪

 2. High-Pressure Fuel Line‪

 4. Engine Sensor Harness‪

Figure 2. Location of Engine Coolant Temperature Sensor on the MBE 4000 Engine

Data from the ECT sensor is routed through wire pin locations 3 and 34 on the large, 55-pin PLD wiring harness connector. See Figure "Pin Locations on 55-Pin Connector" .‪

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 1. 55-Pin Connector‪

 ‪

Figure 3. Pin Locations on 55-Pin Connector

Section 11.2.1
110 00 – Engine Coolant Temperature High

Perform the following steps to troubleshoot a coolant temperature high fault:‪

  1. If fault 110 03 is active in addition to 110 00, refer to "11.2.2 110 03 – Engine Coolant Temperature Sensor Open Circuit" .
  2. If fault 110 04 is active in addition to 110 00, refer to "11.2.3 110 04 – Engine Coolant Temperature Sensor Short to Ground" .
  3. If fault 111 01 is active in addition to 110 00, refer to "12.2.1 111 01 – Engine Coolant Level Low" .
  4. If only fault code 110 00 is active, refer to "11.2.1.1 Required Action" .
Section 11.2.1.1
Required Action

Perform the following steps to resolve a coolant temperature high fault. Repair or replace, as required.‪

  1. Check for coolant loss.
  2. Check for blockage in radiator and charge air cooler.
  3. Check fan belt condition (slippage).
  4. Check for proper location of fan shroud.
  5. Check for proper radiator hose condition (no collapsed hoses).
  6. Check for proper viscous fan operation.

Section 11.2.2
110 03 – Engine Coolant Temperature Sensor Open Circuit

Perform the following steps to troubleshoot a coolant temperature sensor open circuit fault:‪

  1. If faults 105 03 and 110 03 are active at the same time, refer to "10.2.1 105 03 – Intake Air Temperature Sensor Open Circuit" .
  2. If faults 105 03 and 110 03 are not active at the same time, go to step 3 .
  3. Bridge ECT sensor pins 1 and 2. See Figure "Engine Coolant Temperature Sensor Wiring" .
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    Figure 4. Engine Coolant Temperature Sensor Wiring

    1. If fault code 110 04 is not the only active code, go to step 4 .
    2. If fault code 110 04 is the only active code, replace the ECT sensor.
    3. Erase fault code memory.
  4. Bridge pin 1 of the ECT sensor to ground. See Figure "Engine Coolant Temperature Sensor Wiring" .
    1. If fault code 110 04 is still active, repair open circuit in wire between pin 34 of the 55-pin connector and pin 1 of the coolant temperature sensor.
    2. If fault code 110 04 is no longer active, see below.
    3. Erase fault code memory.
  5. Check the resistance between pin 3 of the 55-pin connector and pin 2 of the ECT sensor. See Figure "Engine Coolant Temperature Sensor Wiring" .
    1. If resistance is greater than 3 Ω, refer to "11.2.2.1 Required Action" .
    2. If resistance is less than 3 Ω, refer to "11.2.2.2 Required Action" .
Section 11.2.2.1
Required Action

Perform the following steps to resolve an ECT sensor open circuit fault:‪

  1. Repair open circuit in wire between pin 3 of the 55-pin connector and pin 2 of the ECT sensor.
  2. Erase fault code memory.
Section 11.2.2.2
Required Action

Perform the following steps to resolve an ECT sensor open circuit fault:‪

  1. Check all contacts and connections. Remove corrosion, if evident.
    1. If fault 110 03 is not active, erase fault code memory.
    2. If fault 110 03 is still active, go to step 2 .
  2. Contact Detroit Diesel Technical Service for authorization to replace the PLD-MR. Set parameters on the new PLD-MR.

Section 11.2.3
110 04 – Engine Coolant Temperature Sensor Short to Ground

Perform the following steps to troubleshoot an ECT sensor short-to-ground fault.‪

  1. Unplug the ECT sensor.
    1. If fault 110 03 is not active, go to step 3 .
    2. If fault 110 03 is active, replace ECT sensor.
    3. Erase fault code memory.
  2. Reconnect ECT sensor.
  3. Check the resistance between pin 1 of the ECT sensor and ground. See Figure "Engine Coolant Temperature Sensor Wiring" .
    1. If resistance is greater than 30 kΩ, go to step 4 .
    2. If resistance is 30 kΩ or less, repair short to ground in wire between pin 34 of the 55-pin connector and pin 1 of the ECT sensor.
    3. Erase fault code memory.
  4. Check and clean all contacts.
    1. If fault 110 04 is active after checking and cleaning the contacts, refer to "11.2.3.1 Required Action" .
    2. If fault 110 04 is not active after checking and cleaning the contacts, refer to "11.2.3.2 Required Action" .
Section 11.2.3.1
Required Action

Perform the following steps to resolve an ECT sensor short-to-ground fault.‪

  1. Contact Detroit Diesel Technical Service for authorization to replace the PLD-MR.
  2. Set parameters on the new PLD-MR.
Section 11.2.3.2
Required Action

Perform the following steps to resolve an ECT sensor short-to-ground fault.‪

  1. Erase fault code memory.

Section 11.2.4
110 14 – Engine Coolant Temperature Very High

Perform the following steps to troubleshoot an engine coolant temperature very high fault.‪

  1. If only fault code 110 14 is active, refer to "11.2.4.1 Required Action" .
  2. If fault code 110 03 is active in addition to fault code 110 14, refer to "11.2.2 110 03 – Engine Coolant Temperature Sensor Open Circuit" .
  3. If fault code 110 04 is active in addition to fault code 110 14, refer to "11.2.3 110 04 – Engine Coolant Temperature Sensor Short to Ground" .
Section 11.2.4.1
Required Action

Perform the following steps to resolve a coolant temperature high fault. Repair or replace, as required.‪

  1. Check for coolant loss.
  2. Check for blockage in radiator and charge air cooler.
  3. Check fan belt condition (slippage).
  4. Check for proper location of fan shroud.
  5. Check for proper radiator hose condition (no collapsed hoses).
  6. Check for proper viscous fan operation.


MBE 900/4000 Troubleshooting Guide - 6SE422
Generated on 10-13-2008

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